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Threads messed up....(On endcap, not forum threads :) )

A place to ask general spud cannon related questions.
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Threads messed up....(On endcap, not forum threads :) )

Unread postAuthor: isu22andy » Sun May 18, 2008 8:56 pm

Hi, So I was using my combustion cannon yesterday with STATIC Guard NOT HAIRSPRAY cause it makes junk all sticky...Anyway I flooded the chamber and took the end cap off to see if it would fire...Stupid mistake...It fired and there was like a mini fire inside the chamber...I ran it down to the hyrdont and flushed it with coooool water...Now the cap will only screw on like 1-2 turns...Is it safe to fire? Is there anyway to rethread it? Would buying a new endcap fix this?
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Unread postAuthor: elitesniper » Sun May 18, 2008 9:03 pm

Well post some pictures of the threads, please then we could visually see what your problem is :)
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Unread postAuthor: isu22andy » Sun May 18, 2008 9:05 pm

Hmmm....I'll think about pictures...But I really dont see why it screws on so much harder...The threads are VERY SLIGHTLY flat at the top on one side and just wont screw on very well....I'll be back with pic's I think, My camera sucks though
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Unread postAuthor: bigbob12345 » Sun May 18, 2008 9:06 pm

Yes definitely post pics
But my immediate reccomendation would be to cut off the male adaptor and glue on a new one, and get a new endcap if that got melted at all.
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Last edited by bigbob12345 on Sun May 18, 2008 9:28 pm, edited 1 time in total.
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Unread postAuthor: DYI » Sun May 18, 2008 9:22 pm

Yes definately post pics
But my immediate reccomendation would be to cut off the female adaptor and glue on a new one, and get a new endcap if that got melted at all.


If he's using a cap rather than a plug, there'd be male threads on the chamber, and female threads on the cap. Which makes me wonder how the threads were damaged at all by a fire inside the chamber...
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Unread postAuthor: bigbob12345 » Sun May 18, 2008 9:29 pm

Changed it to male adaptor
Happy now?
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Unread postAuthor: rp181 » Sun May 18, 2008 9:29 pm

Dont be so critical =)

Im guessing its a cleanout cap.
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Unread postAuthor: isu22andy » Sun May 18, 2008 9:41 pm

My cap is the one that has threads on it. I screw it in the gun......
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Unread postAuthor: CS » Sun May 18, 2008 10:04 pm

What you might try...

Screw your threaded plug in pretty hard with a large wrench. This is done in attempt to forcefully remove debris, or thread imperfections. I will do it with new plugs, or plugs with damaged threads. Worth a try.
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Unread postAuthor: isu22andy » Sun May 18, 2008 10:08 pm

here are pics.

Image

tator gun from far away...

Image

Screwed in as far as i can get it...Hand tightened.

Image

Male threads on cap.


Image

Femal end on gun.


I wire brushed both ends with little to no results....Please help
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Last edited by isu22andy on Sun May 18, 2008 10:09 pm, edited 1 time in total.

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Unread postAuthor: STHORNE » Sun May 18, 2008 10:09 pm

You could just go buy yourself a brass end cap and work that in there. It should re-thread it if you do it right. I suggest putting the brass cap in a vice and twisting the gun itself onto it. That way, you have the weight of the gun, and whatever weight you put on it working with you to force that puppy in.

Or...if it's just a matter of it being dirty/a little deformed, you could just spray it down with some Pam and scrub the inside with a wire brush. This would help with my end cap problems on my basic combustions back when I used hairspray.
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Unread postAuthor: n-strike » Sun May 18, 2008 10:44 pm

No, it is not safe to fire. I am pretty sure that you don't want to have a plug flying right at your face at...a really high speed. I don't think that you can rethread it, and I am pretty sure that buying a new plug would not fix this. I suggest you try to screw it in all the way with pliers, and then unscrew it, and then repeat the process about...I don't know, maybe about ten times and the see if it gets any better. If it doesn't get any better, come back here, and tell me so I will know for the future if it actually works or not...and no, I did not just make this up right now, I actually studied it to see if it actually works :wink: No, but seriously, I am pretty sure that this will work. Stop thinking that I randomly thought of something...I am pretty sure that this will work.
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Unread postAuthor: DYI » Sun May 18, 2008 10:51 pm

Male threads on cap.


I believe those two terms are mutually exclusive in the plumbing world... :roll:

Getting rid of that thing (whatever it is, possibly a cleanout plug?) and replacing it with a proper, pressure rated threaded plug would be in your best interests.

I don't see how a brass cap would help at all, considering that it would have female threads and all, and a brass plug would cost you a fortune and a half. You could get a malleable iron plug from McMaster if you really want to get the crap out of the threads.
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Unread postAuthor: TurboSuper » Sun May 18, 2008 10:58 pm

Standing in front of the cleanout plug is never a good idea, whether it's threads are screwed up or not.

Still, I wouldn't recoomend using it, 1 or 2 turns ain't much :?
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Unread postAuthor: daxspudder » Sun May 18, 2008 11:57 pm

Whenever you have a misfire be sure to fully air out your chamber before testing your ignition. As far as your threads are concerned the pam idea above is a good one, but you may have burned and ruined the inner threads possibly melting them out of shape. You could try using a adjustable wrench on your cleanout plug to force thread it, or just scrap the gun a build a new one. Sometimes i can only thread mine 2 FULL turns, as long as your not using propane 2 threads should be enough, but more is obviously better. GL
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